如何制作可移動的疊加層？-有解無憂

我想在應用程式頂部顯示一個最小化的可移動呼叫螢屏如何制作可移動的疊加層？

我嘗試使用堆疊它不符合我的期望

uj5u.com熱心網友回復：

@Raiyan，您必須使用畫中畫概念來實作這樣的浮動孩子。

在 Flutter 中，有多個插件可供我們使用，其中一些如下：

可悲的是 gif 無法正常作業......但是通過在綠色視窗上點擊和拖動將使綠色視窗移動。

嘗試這個：

import 'dart:math';

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter  ;
    });
  }

  @override
  Widget build(BuildContext context) {
    return OverlayWindow(
      overlayChild: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: const [
          Text(
            "Overlay Window",
            style: TextStyle(fontSize: 20),
          ),
          Icon(
            Icons.android,
            size: 80,
          ),
        ],
      ),
      child: Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text(
                'You have pushed the button this many times:',
              ),
              Text(
                '$_counter',
                style: Theme.of(context).textTheme.headlineMedium,
              ),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: _incrementCounter,
          tooltip: 'Increment',
          child: const Icon(Icons.add),
        ),
      ),
    );
  }
}

class OverlayWindow extends StatefulWidget {
  const OverlayWindow(
      {Key? key, required this.overlayChild, required this.child})
      : super(key: key);

  final Widget overlayChild;
  final Widget child;

  @override
  State<OverlayWindow> createState() => _OverlayWindowState();
}

class _OverlayWindowState extends State<OverlayWindow> {
  double _top = 0;
  double _left = 0;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        widget.child,
        Positioned(
          top: _top,
          left: _left,
          child: GestureDetector(
            onPanUpdate: (details) {
              setState(() {
                _top = max(0, _top   details.delta.dy);
                _left = max(0, _left   details.delta.dx);
              });
            },
            child: Container(
              height: 300,
              width: 200,
              color: Colors.green,
              child: widget.overlayChild,
            ),
          ),
        )
      ],
    );
  }
}

更多類似的事情，你可以在這里找到：

https://docs.flutter.dev/development/ui/advanced/gestures

轉載請註明出處，本文鏈接：https://www.uj5u.com/net/520887.html

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